How to access a class from blenders python console?
You can access classes for registered operators via bpy.types.

eg:

cls = bpy.types.OBJECT_OT_make_dupli_face

import inspect

inspect.getsourcefile(cls)
# 'release/scripts/startup/bl_operators/object.py'

inspect.getsource(cls)
# 'class MakeDupliFace(Operator):\n    """Convert objects ... &lt;snip&gt;